package com.xr.activiti.utils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.context.SecurityContextImpl;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.stereotype.Component;

import java.util.Collection;


@Component
public class SecurityUtil
{
    private Logger logger = LoggerFactory.getLogger(SecurityUtil.class);

    @Qualifier("myUserDetailsService")
    @Autowired
    private UserDetailsService userDetailsService;

    public void logInAs(String username)
    {
        UserDetails user = userDetailsService.loadUserByUsername(username);

         if (user == null)
         {
             throw new IllegalStateException("User " + username + " doesn't exist, please provide a valid user");
         }

         logger.info("> Logged in as: " + username);

         SecurityContextHolder.setContext(
                 new SecurityContextImpl(
                         new Authentication()
                         {
                             @Override
                             public Collection<? extends GrantedAuthority> getAuthorities()
                             {
                                 return user.getAuthorities();
                             }
                             @Override
                             public Object getCredentials() {
                                 return user.getPassword();
                             }
                             @Override
                             public Object getDetails() {
                                 return user;
                             }
                             @Override
                             public Object getPrincipal() {
                                 return user;
                             }
                             @Override
                             public boolean isAuthenticated() {
                                 return true;
                             }
                             @Override
                             public void setAuthenticated(boolean isAuthenticated) throws IllegalArgumentException { }
                             @Override
                             public String getName() {
                                 return user.getUsername();
                             }
                        }));
         org.activiti.engine.impl.identity.Authentication.setAuthenticatedUserId(username);
    }
}
